Study on Performance Characteristics and Influencing Factors of Four-outlet Centrifugal Pump

Abstract

In order to study the influence of different geometric parameters and performance parameters on the external characteristics and outlet head uniformity of a single-stage multi-outlet centrifugal pump, a certain single-stage four-outlet water pump was chosen as the research object. Under the premise of keeping all parameters except the target parameter constant, the number of impeller blades, outlet width, and mass flow rate at the outlet were studied separately to explore the variation trends of the average pressure fluctuation rate and average head when the number of blades changed from 5 to 8. The study was combined with numerical simulation calculations. The research showed that as the number of blades increased, the head of the centrifugal pump gradually increased. When the number of blades was between 5 and 7, the increase in head was more significant, with an increase of 0.61m. When the number of blades increased to 8, the increase in head became relatively gentle, with only a 0.17m increase. When the impeller blades increased from 5 to 6, the pressure fluctuation rate at the outlet decreased by 0.4%. When the number of blades increased to 7, the pressure fluctuation rate decreased by 1.85%. When the number of blades increased to 8, the pressure fluctuation rate decreased by 0.8%. When the outlet width changed from 5.2mm to 6.7mm, the head increased by 0.4m, with an increase of 6.4%, and the pressure fluctuation rate at the outlet decreased by 2.9%. As the outlet flow rate increased from 15L/min to 30L/min, the head of the centrifugal pump decreased by 1m, and the pressure fluctuation rate at the outlet increased by 3.4%, indicating an increasing difference in head among the outlets.